Growth law of oxygen-rich α layer of three titanium alloys

doi:10.13251/j.issn.0254-6051.2023.11.011

Abstract

Abstract: Evolution of oxygen-rich α layer of three titanium alloy (TC2, TC4 and TC6 alloys) at various heat treatment conditions was studied. The forming kinetics and thermal activation energy of oxygen-rich α layer were discussed. The results show that the thickness of oxygen-rich α layer increases with the increase of heating temperature and holding time. And heating temperature is main factor. The growth of the oxygen-rich α layer is affected by the oxygen diffusion process, and the thickness is linear with t^1/2. The forming of oxygen-rich α layer belongs to thermal activation behavior, and the layer thermal activation energies of TC2, TC4 and TC6 alloys are 106.1, 110.1 and 47.7 kJ/mol, respectively. Due to the strengthening effect of oxygen, the microhardness of the oxygen-rich α layer is higher than the matrix. The thickness measured by microhardness method is higher than that by metallographic observation method.

Key words: titanium alloy, oxygen-rich α layer, microhardness, thermal activation energy

CLC Number:

TG146.2

Yan Wenxuan, Shao Zhuhao, Li Wei, Liu Jing, Wei Xiaoyan, Gu Guojun. Growth law of oxygen-rich α layer of three titanium alloys[J]. Heat Treatment of Metals, 2023, 48(11): 68-72.

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